Font utilities
This module provides functions and classes for working with system fonts and measuring text dimensions. It includes a utility function to search for a system font file that matches a given font family and weight, as well as a class to measure the width and height of rendered text using the PIL library.
get_system_font_path
get_system_font_path(
font_family: str,
weight: int = 400,
weight_tolerance: int = 100
) -> str | None
Searches common system directories for a TrueType or OpenType font file (.ttf or .otf) that matches the specified font_family and is within the desired weight tolerance.
Parameters
font_family(str): The desired system font name (e.g., "Arial").weight(int, optional): The numeric weight (e.g., 400 for regular, 700 for bold; default: 400).weight_tolerance(int, optional): Allowed difference between the desired weight and the font's actual weight (default: 100).
Returns
(str | None): The full path to the matching font file, or None if no match is found.
path = get_system_font_path("Arial", 400)
if path:
print("Found font:", path)
else:
print("Font not found")
TypographyMeasurer
The TypographyMeasurer class measures the rendered width and height of text given a specific font and size. It converts point sizes to pixels based on the provided DPI and leverages the PIL library for text measurement.
Parameters
dpi(float, optional): Dots per inch for converting point sizes to pixels (default: 72.0).font_path(str | None, optional): The path to a font file. If not provided, the system is searched using get_system_font_path.
measure_text
measure_text(
text: str,
font_family: str | None = None,
weight: int | None = None,
font_size: float = 12.0
) -> tuple[float, float]
Measures the width and height (in pixels) of the provided text when rendered in the specified font. Multiline text is supported if newline characters are present.
Parameters
text(str): The text to measure.font_family(str | None, optional): The system font name (e.g., "Arial"). Required if no font_path is already set.weight(int | None, optional): Numeric weight (e.g., 400 for regular, 700 for bold). Required if no font_path is already set.font_size(float, optional): The desired font size in points (default: 12.0).
Returns
(tuple[float, float]): A tuple (width, height) in pixels.
raises ValueError: If the specified font cannot be found (when both font_path is not provided and font_family or weight are missing).